Here's a little list I prepared for another site
Ah the mystery of the interweb eh?
ITWIM - Is this what it means?
KISS - Keep it simple Stupid (not you I hasten to add)
KWIM - Know what I mean
DIM - Did it myself
RE - Reference
SAR -Smart a** Remarks
ROTFLSHISMC, ROFLMAO - variations on ROFL Rolling on the floor larfing ie ROFL so hard I spilled my coffeee, ROFl my a** off, ROFLMHO - Rolling On Floor Laughing My Head Off,
ROFLOL - Rolling On the Floor Laughing Out Loud and so on...
PTMM - Please tell me more
YKWIM - You know what I mean
POV - Point of view
OTOH - On the other hand
ISO - In search of [answers, enlightenment, the bloke who smacked my car etc.)
IMHO - In My Honest Opinion
HAK - Hugs and kisses
HAND - Have a nice day [y'all]
GTG - Got to go
GR8 - Great
BBS - Be back soon
TTFN - (A real old one this) Ta Ta for now
Like all jargon it is doublespeak and therefore doubleplus ungood!
Here's hoping it helps